{"note":"bim_versions 導入後の保存のみ記録 (それ以前は bim_canonical 上書きで履歴なし)","ok":true,"slug":"u-house-cb5g335w","versions":[{"created_at":"2026-08-14T09:25:27Z","element_count":101,"note":"loop3: 設計時延床 80.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"56b184968c6ca4f54d9b7da023184e675cd6872fdc9ced028dc19d72ed29577f","version":2},{"created_at":"2026-08-14T09:25:26Z","element_count":101,"note":"言葉から生成: LDK+主寝室+子供室2+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}